In distributed admission control (AC) schemes, handling concurrent AC decisions
assumes a relevant role in avoiding over or false acceptance and, consequently,
service quality degradation. This problematic is even more intricate in multiservice
network environments where distinct service levels need to be fulfilled.
This paper debates and points out solutions to mitigate the negative impact that
distributed admission of flows might have on the service level guarantees provided
to network customers.
Keeping in mind that simplicity is a key factor for deployable AC solutions, we
suggest and discuss the use of (i) a service-dependent concurrency index;
(ii) a token-based system and (iii) a rate-based credit system, as alternative or
complementary proposals to minimize or solve QoS degradation resulting from AC
false acceptance.